```dart{5}
@override
Widget build(BuildContext context) {
  return Authenticator(
    totpOptions: const TotpOptions(issuer: 'Authenticator Demo'),
    child: MaterialApp(
      builder: Authenticator.builder(),
      home: Scaffold(
        body: Center(
          child: Text('You are logged in!'),
        ),
      ),
    ),
  ),
}
```
